Abstract
Active land disturbance of soil and environments appears even in remote landscapes of tundra and forest tundra. Wildfires become a frequent factor of soil degradation and intensification of permafrost degradation, also affecting the global balance of carbon, especially content and distribution of polycyclic aromatic compounds. Mature unaffected by fire sandy-textured podzols soils were investigated in comparison with the same soil strongly affected by surface fire in the end of August 2016 in surroundings of the Pangody settlement, Nadym district, Yamal region. Data obtained showed an intensive morphological transformation of the topsoil layers, decreasing total organic matter and apparently increasing the humus enrichment by nitrogen. Wildfires also result in complete transformation of the fractional composition of the polycyclic aromatic compounds. The sum of PAHs increases intensively as well as benzo(a)pyrene content in soils. Therefore, soils of the cryolithozone become more faced to the wildfires during the last decades. Even one-time fire effect results in serious transformation of soil geochemical state.
Highlights
IntroductionAnthropogenic successions caused by climate dynamics and effects of natural (windfalls and pests irruption), natural and anthropogenic (wildfires), and anthropogenic (logging) phenomena are characteristic of tundra and forest ecosystems. e human impact on natural biogeocenoses, which becomes more actual nowadays, leads to a change in ecosystems functioning and makes monitoring work extremely important
Anthropogenic successions caused by climate dynamics and effects of natural, natural and anthropogenic, and anthropogenic phenomena are characteristic of tundra and forest ecosystems. e human impact on natural biogeocenoses, which becomes more actual nowadays, leads to a change in ecosystems functioning and makes monitoring work extremely important
Study Site and Soil Sampling. e research object is located near Pangody settlement, Nadym district, Yamal region, Western Siberia, Russia (N 6550-356, E 074-24-210). e study plots are represented by forest-tundra ecosystem, sublayered by stratified parent material, namely, sand sublayered by silty textured permafrost grounds. e objects of investigation for comparison fire effect are two soils pits (2 soil profiles) presented by mature soil, podzol, and fire-affected soil, which was initially the same with mature podzol soils
Summary
Anthropogenic successions caused by climate dynamics and effects of natural (windfalls and pests irruption), natural and anthropogenic (wildfires), and anthropogenic (logging) phenomena are characteristic of tundra and forest ecosystems. e human impact on natural biogeocenoses, which becomes more actual nowadays, leads to a change in ecosystems functioning and makes monitoring work extremely important. E human impact on natural biogeocenoses, which becomes more actual nowadays, leads to a change in ecosystems functioning and makes monitoring work extremely important. A variety of research studies are devoted to pyrogenic transformation of the water regime, vegetation, and forest landscapes in whole [6,7,8,9,10,11,12,13,14,15]. Data on similar studies of the pyrogenic transformation in polar, tundra, and subboreal landscapes of cryolithozone are extremely rare in the literature. Erefore, the purpose of this work is to study soil changes after wildfires affect the cryolithozone of tundra and foresttundra ecosystems Data on similar studies of the pyrogenic transformation in polar, tundra, and subboreal landscapes of cryolithozone are extremely rare in the literature. e main directions in this field are research studies on postpyrogenic transformation of plant cover. erefore, the purpose of this work is to study soil changes after wildfires affect the cryolithozone of tundra and foresttundra ecosystems
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